Some Players Cheat!
Unfortunately, not all players handle 16:9 video correctly. The aspect ratio setting for each
track is stored in the track’s video title set file (vts_01_1.vob, for example). Most DVD
players read the setting and process it correctly, but some DVD players ignore this setting
and instead look at the aspect ratio setting of the video itself. For the most part, this works
out, but it can result in inconsistencies when playing the title on different DVD players,
particularly if you are not careful while encoding and authoring.